<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=
  , initial-scale=1.0">
  <title>Document</title>
  <style>
    body{
      margin: 0;
    }
    #wrap {
      margin: 20vh auto;
      width: 260px;
      height: 50vh;
      border: 1px solid black;
      overflow: hidden;
    }
    #list{
      margin: 0;
      padding: 10px 5px;
      list-style:none;
      font: 16px/2 "宋体"; 
      height: 50vh;
    }
    #list li{
      text-align: center;
      border-bottom: 1px solid royalblue;
    }
  </style>
</head>
<body>
  <div id="wrap">
    <ul id="list">
      
    </ul>
  </div>
  <script>
    let list = document.querySelector('#list')
    list.innerHTML = new Array(100).fill(0).map((item, idx) => {
      return `<li>这是第${idx+1}个li</li>`
    }).join('')
  </script>
  <script>
    // let list = document.querySelector("#list")
    let startPoint = 0 // 按下时鼠标的位置
    let startEl = 0 // 按下时元素的位置
    let y = 0
    list.addEventListener("touchstart", e => {
      let touch = e.changedTouches[0]
      startPoint = touch.clientY
      startEl = y
    })
    list.addEventListener("touchmove", e=> {
      let touch = e.changedTouches[0]
      let nowPoint = touch.clientY
      y = startEl + (nowPoint - startPoint)
      list.style.transform = `translate3d(0,${y}px, 0)`
    })
  </script>
</body>
</html>